Refrigerator



FIG. 1 is a top left front perspective view of a refrigerator showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right-side elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The dashed broken lines are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a refrigerator, as shown and described. 